My dealer adjusted the stops for me a month ago and the X is been rattle free since!! The gate has to be slamed hard to close otherwise I get the tail gate is open message if I close it softly. I think they turned the stops too far out! I like the felt idea and I'm going to turn them in slightly and use the felt along with that. Great site with many helpful fellow X'fifers : )

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Current:
2017 640Xi Convertible
2011 Acura MDX
2018 Santa Fe

Past:
2013 Honda Accord
2008 Acura TL Tech.------2004 BMW X5 4.8is----2004 Acura MDX Tech
1994 BMW 525i.----------1994 Lexus 300 GS.----1994 Acura Legend GS
1991 Acura Legend LS.----1991 Honda Accord.----1991 300ZX twin turbo
1996 Buick Regal GS.-----1984 300Z 50th anniv.--2002 BMW X5
1982 280Z